21426311618 has 16 divisors (see below), whose sum is σ = 33540224256. Its totient is φ = 10246331040.

The previous prime is 21426311587. The next prime is 21426311659. The reversal of 21426311618 is 81611362412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634583 + ... + 667493.

It is an arithmetic number, because the mean of its divisors is an integer number (2096264016).

Almost surely, 2^21426311618 is an apocalyptic number.

21426311618 is a deficient number, since it is larger than the sum of its proper divisors (12113912638).

21426311618 is a wasteful number, since it uses less digits than its factorization.

21426311618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47089.

The product of its digits is 13824, while the sum is 35.

The spelling of 21426311618 in words is "twenty-one billion, four hundred twenty-six million, three hundred eleven thousand, six hundred eighteen".